Marstoniopsis is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks or micromollusks in the family Amnicolidae.
Species Species within the genus Marstoniopsis include: Marstoniopsis armoricana (Paladilhe, 1869) Marstoniopsis croatica Schütt, 1974 Marstoniopsis graeca (Radoman, 1978)Radea C., Parmakelis A., Papadogiannis V., Charou D. & Triantis K. (2013). "The hydrobioid freshwater gastropods (Caenogastropoda, Truncatelloidea) of Greece: new records, taxonomic re-assessments using DNA sequence data and an update of the IUCN Red List Categories". ZooKeys 350: 1-20. . Marstoniopsis insubrica (Küster, 1853) - synonym: Marstoniopsis scholtzi (Schmidt, 1856)Falniowski A. & Wilke T. (2001). "The genus Marstoniopsis (Gastropoda: Rissooidea): intra- and intergeneric phylogenetic relationships". Journal of Molluscan Studies 67 (4): 483-488. . Marstoniopsis vrbasi Bole & Velkovrh, 1987
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